How can I install Sun Java?

Hi,
I cannot run sweet home 3d.
I have ubuntu 13.04.
Some day when I was try to update sweet home 3d for version 4.0 it stopped to run. I uninstalled it and reinstalled version 3.7 and keep to not run.
I can no longer use in the sweet home 3d.

I don't know how to install in ubuntu

Yes it is working perfectly. Thank you.
But now I would like to upgrade to the latest version. I still have version 3.5 on my ubuntu.

Hi,
How can I install latest version of Sweet Home 3D in ubuntu 12.10?
In Ubuntu Software center there is Sweet Home 3D version 3.5 and there is some bugs.